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Date: Tue, 12 May 2020 20:55:38 -0400 From: "Theodore Y. Ts'o" <tytso@....edu> To: Eric Biggers <ebiggers@...nel.org> Cc: linux-fscrypt@...r.kernel.org, linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net, Jaegeuk Kim <jaegeuk@...nel.org>, Daniel Rosenberg <drosen@...gle.com> Subject: Re: [PATCH 2/4] fscrypt: add fscrypt_add_test_dummy_key() On Tue, May 12, 2020 at 04:32:49PM -0700, Eric Biggers wrote: > From: Eric Biggers <ebiggers@...gle.com> > > Currently, the test_dummy_encryption mount option (which is used for > encryption I/O testing with xfstests) uses v1 encryption policies, and > it relies on userspace inserting a test key into the session keyring. > > We need test_dummy_encryption to support v2 encryption policies too. > Requiring userspace to add the test key doesn't work well with v2 > policies, since v2 policies only support the filesystem keyring (not the > session keyring), and keys in the filesystem keyring are lost when the > filesystem is unmounted. Hooking all test code that unmounts and > re-mounts the filesystem would be difficult. > > Instead, let's make the filesystem automatically add the test key to its > keyring when test_dummy_encryption is enabled. > > That puts the responsibility for choosing the test key on the kernel. > We could just hard-code a key. But out of paranoia, let's first try > using a per-boot random key, to prevent this code from being misused. > A per-boot key will work as long as no one expects dummy-encrypted files > to remain accessible after a reboot. (gce-xfstests doesn't.) > > Therefore, this patch adds a function fscrypt_add_test_dummy_key() which > implements the above. The next patch will use it. > > Signed-off-by: Eric Biggers <ebiggers@...gle.com> Reviewed-by: Theodore Ts'o <tytso@....edu>
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